Add 'libgomp.c-c++-common/pr100059-1.c'

For nvptx offloading, it'll FAIL its execution test until nvptx-tools updated
to include commit 1b5946d78ef5dcfb640e9f545a7c791b7f623911
"Merge commit '26095fd01232061de9f79decb3e8222ef7b46191' into HEAD [gcc-mirror#29]",
<SourceryTools/nvptx-tools@1b5946d>.

	libgomp/
	* testsuite/libgomp.c-c++-common/pr100059-1.c: New.

Co-authored-by: Thomas Schwinge <thomas@codesourcery.com>

libgomp/testsuite/libgomp.c-c++-common/pr100059-1.c

@@ -0,0 +1,55 @@
+/* Based on sollve_vv's tests/5.0/declare_target/test_nested_declare_target.c.  */
+
+#define N 1024
+int a[N], b[N], c[N];  
+int i = 0;
+
+void
+update ()
+{ 
+  for (i = 0; i < N; i++)
+    {
+      a[i] += 1;
+      b[i] += 2;
+      c[i] += 3;
+    }
+}
+
+#pragma omp declare target 
+#pragma omp declare target link(a,c,b,i)
+#pragma omp declare target to(update)  
+#pragma omp end declare target
+
+int
+main ()
+{
+  for (i = 0; i < N; i++)
+    {
+      a[i] = i;
+      b[i] = i + 1;
+      c[i] = i + 2;
+    }
+
+  //__builtin_printf("i=5: A=%d, B=%d, C=%d\n", a[5], b[5], c[5]);
+
+  #pragma omp target map(to: i) map(tofrom: a, b, c) 
+  {
+    update();  /* Device. */
+  }
+
+  //__builtin_printf("i=5: A=%d, B=%d, C=%d\n", a[5], b[5], c[5]);
+
+  for (i = 0; i < N; i++)
+    if ( a[i] != i + 1 || b[i] != i + 3 || c[i] != i + 5)
+      __builtin_abort();
+
+  update();  /* Host. */
+
+  //__builtin_printf("i=5: A=%d, B=%d, C=%d\n", a[5], b[5], c[5]);
+
+  for (i = 0; i < N; i++)
+    if ( a[i] != i + 2 || b[i] != i + 5 || c[i] != i + 8)
+      __builtin_abort ();
+
+  return 0;
+}